Ball-bearing caster



F. KIRSCHKE.

BALL BEARING GASTER. APPLICATION FILED FEB. 20. 1920.

Patented Oct. 24, 1922.

Patented .Qct. 241-, i922.

entree FRANK KIRSOHKE, OF PHILADELPHIfi,

PENNSYLVANIA.

BALL-BEARENG CASTER.

Application filed February 20, 1820. Serial No. 360,079.

To (ZZZ whom it may concern-.-

Be it known that I, FRANK Kinsonitn, a citizen of the United States, residing at Philadelphia, in the county of Philadelphia and State of Pennsylvania, have invented new and useful Improvements in Ball-Bearingi Casters, of which the following is a specification.

My invention relates to a new and useful improvement in ball bearing casters, and has for its object to provide an enceedingly, simple and effective device of this decription which may be readily applied to legs of furniture and which when so applied will permit the easy rolling of said furniture in any direction desired.

With these ends in view, this invention consists in the details of construction and combination of elements hereinafter set forth and then specifically designated by the claim.

In order that those skilled in the art to which this invention appertains, may understand how to make and use the same, I will describe its construction in detail, referring by numerals to the accompanying drawing forming a part of this application, in which Fig. l, is a plan view of a caster made in accordance with my improvement.

Fig. 2, is a side elevation of acaster.

Fig. 3, isa central vertical section of Fig. 1.

Fig. 4, is a section at the line 4% of Fig. 3 the upper or secondary ball being omitted.

In carrying out my invention, as here embodied, 1 represents the casing of the caster which serves as a housing for the balls and this casing has a dome 2- forined therewith of somewhat reduced diameter. Projecting up from the dome is a hollow shank or spindle 3 having slots 4 formed in the side walls thereof and 5 represents a spring composed of two legs and having a head 6 formed therewith which head fits within the up- 5 per portion of the spindle while the major portion of each leg of the spring bows outward through the slots 3, the lower ends of said legs being confinedin the lower por tion of the spindle. This arrangement permits the forcing of the spindle into a hole or bore formed in the leg of the piece of furniture to which the caster isto be applied and the compression of the legs of the spring so as to cause them to exert sufparting from ticien; p e

sure upon the side walls of the a1 7 re sents a flange or washer which is ntendec to seat upon the bottom of the leg in which the caster is inserted to give a wide bearing 8 represen at this point.

ts the primary or caster ball .ch is fitt d within the casing 1 andthere in place by the f= rule 9 which latter '1 d over the lower edges of the casing and held in place by being crimped thereon or by the screw threading or any other well ltnown or convenient method.

10 rep. e ents the secondary ball which is fitted wi 1111 the dome 2, between the primary and the secondary balls are arranged a series of anti iriction balls 11 of smaller diameter, the erior wall contracted and the upuer portion of the casing serving as 4 f- 3 these anti-friction balls.

. in this description it will be seen that when the primary ball 8 is moved over a surface and as a floor it will revolve in any aection necessary to follow the movements of the caster and these movements will be transmittal to the antifriction balls 11 and through them to the secondary ball 10 thus movements of the primary ball 8 permitting the piece of furniture to which the casters are attached to be easily moved in any direction without undue drag upon the floor si 0f arse I do not wish to be limited to the exact details of construction as herein show as these may be varied within the limits of the appended claim without de spirit of my invention.

Having the. sully described my invention, what: I claim as new and useful is:

A, caster COHlPPlSiDg a housing for balls, a holler-3' shank formed integral with the housing and having diametrically opposite longitudinal slots therein and a spring provided with a head and outwardly bowed legs, saicspring being longer than the slots and located within the shank so that the head and the lower ends of its legs are housed therein while the major portions of the legs normally project through the slots. I

In testimonywhereof, I have hereunto affined my signature.

FRANK KIRSCHKE. 

